Note: If you've chosen this project from the New Project window in the app, it's pre-configured with CAD or mesh files, settings, pre-run simulations, visualization filters, and more.
Use this guide to create this case from scratch with a blank project.
This project is made up of three mesh volumes: the stationary background mesh and far field (Volume 1) and two rectangular rotor meshes that rotate in opposite directions (Volumes 2 and 3). The rotor meshes overlap each other as well as the background mesh.
You'll assign the outer surfaces of the rotors to an overset boundary condition. This is the boundary where information will be exchanged between meshes. The final solution will show us only the calculated cells. Cells that were interpolated or inactive will be hidden.
Project Files
Project Files
Set Up the Simulation
Download the above mesh and settings files (expand Project Files).
Create a new blank project.
Upload the mesh file.
Upload the settings file. Click the three dot (...) menu at the top of the control panel and select Upload Settings, then select the file from your file browser. This settings file will assign the wall and symmetry boundary conditions, as well as set up the frames for motion.
Define the Overset Boundary Condition
You’ll notice a number of surfaces haven’t been assigned a boundary condition. These are the outer boundaries of each rotor. We’ll create an overset boundary condition and assign the remaining surfaces:
In the control panel, find and expand the Physics section.
Expand Fluid Flow and click the Boundary Conditions section.
In the properties panel, you will see the remaining undefined surfaces. Click Define All and select Overset.
At the top of the control panel, click Run Simulation.
You’ll be taken to the simulation tab for this run. Once it's finished running, you'll view the results.
View the Results
Find the dropdown in the upper left corner of the 3D Viewer. Select Velocity from the list. You should only see the calculated cells in the final result:
If you zoom in, you can see where calculated cells from both meshes are overlapping.
